26 |
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
27 |
POSSIBILITY OF SUCH DAMAGE. */ |
POSSIBILITY OF SUCH DAMAGE. */ |
28 |
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|
29 |
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/* $Id $*/ |
30 |
|
|
31 |
/* |
/* |
32 |
itoa.S |
itoa.S |
33 |
|
|
68 |
mov r_lstr_hi, ZH |
mov r_lstr_hi, ZH |
69 |
clt ; make sure T flag is clear |
clt ; make sure T flag is clear |
70 |
cpi r_radix, 2 ; no radix < 2 |
cpi r_radix, 2 ; no radix < 2 |
71 |
brlt terminate ; return with \0 |
brlt 99f ; return with \0 |
72 |
cpi r_radix, 37 ; no radix > 36 |
cpi r_radix, 37 ; no radix > 36 |
73 |
brge terminate ; return with \0 |
brge 99f ; return with \0 |
74 |
cpi r_radix, 10 ; decimal number ? |
cpi r_radix, 10 ; decimal number ? |
75 |
brne divide_loop ; no -> convert |
brne 1f ; no -> convert |
76 |
bst r_val_hi, 7 ; for decimal numbers remember sign of value |
bst r_val_hi, 7 ; for decimal numbers remember sign of value |
77 |
brtc divide_loop ; positive number -> convert |
brtc 1f ; positive number -> convert |
78 |
com r_val_hi ; negative number -> make positive |
com r_val_hi ; negative number -> make positive |
79 |
neg r_val_lo |
neg r_val_lo |
80 |
sbci r_val_hi, 0xff |
sbci r_val_hi, 0xff |
81 |
divide_loop: |
1: |
82 |
mov r22, r_radix ; radix |
mov r22, r_radix ; radix |
83 |
clr r23 ; dividend in r25:r24, divisor in r23:r22 |
clr r23 ; dividend in r25:r24, divisor in r23:r22 |
84 |
XCALL _U(__udivmodhi4); quotient in r23:r22, remainder in r25:r24 |
XCALL _U(__udivmodhi4); quotient in r23:r22, remainder in r25:r24 |
86 |
; call-used but preserved: r18, r19, r20, r30, r31 |
; call-used but preserved: r18, r19, r20, r30, r31 |
87 |
subi r24, 0xd0 ; + '0' |
subi r24, 0xd0 ; + '0' |
88 |
cpi r24, 0x3a ; > '9' ? |
cpi r24, 0x3a ; > '9' ? |
89 |
brlt L_10 |
brlt 10f |
90 |
subi r24, 0xd9 ; + 'a' - 10 - '0' |
subi r24, 0xd9 ; + 'a' - 10 - '0' |
91 |
L_10: |
10: |
92 |
st Z+, r24 ; write char to string in reverse order |
st Z+, r24 ; write char to string in reverse order |
93 |
mov r_val_lo, r22 ; quotient -> dividend |
mov r_val_lo, r22 ; quotient -> dividend |
94 |
mov r_val_hi, r23 |
mov r_val_hi, r23 |
95 |
sbiw r_val_lo, 0 ; value == 0 ? |
sbiw r_val_lo, 0 ; value == 0 ? |
96 |
brne divide_loop |
brne 1b |
97 |
brtc terminate ; T flag clear? -> positive number |
brtc 99f ; T flag clear? -> positive number |
98 |
ldi r21, '-' |
ldi r21, '-' |
99 |
st Z+, r21 ; write minus sign to string |
st Z+, r21 ; write minus sign to string |
100 |
terminate: ; restore &string as return value |
99: |
101 |
mov r_val_hi, r_lstr_hi |
mov r_val_hi, r_lstr_hi ; restore &string as return value |
102 |
mov r_val_lo, r_lstr_lo |
mov r_val_lo, r_lstr_lo |
103 |
st Z, __zero_reg__ ; terminate string |
st Z, __zero_reg__ ; terminate string |
104 |
XJMP _U(strrev) ; reverse string |
XJMP _U(strrev) ; reverse string |